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Explain crossed aldol condensation with ...

Explain crossed aldol condensation with suitable examples

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Aldol condensation : Aldehydes and ketones having at least one a-hydrogen undergo a reaction in the presence of dilute alkali as catalyst to form.`beta` -hydroxy aldehydes (aldol) or `beta`-hydroxy ketones (ketol), respectively. This is known as Aldol reaction.
`2CH_(3)-CHOoverset(dillute NaOH) rarr CH_(3)-underset(OH)underset(|)CH-CH_(3)-CHOunderset(H_(2)O)overset(triangle)rarr CH_(3)-CH=CH-CHO`
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